<?php
/**
 * crcl/base
 *
 * Copyright 2013 CRCL - André Sabosch - info@crcl.de
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * UUID related functions
 */

namespace crcl\base\string;

interface IUuid
{
  /**
   * Returns UUID (v4 - random)
   *
   * @return string UUID
   */
  public static function create();
}

abstract class Uuid implements IUuid
{
  public static function create()
  {
    if (\crcl\base\System::isWindows())
    {
      //remove from coverage analysis
      //@codeCoverageIgnoreStart
      if (function_exists('com_create_guid') === true)
      {
        return \trim(\com_create_guid(), '{}');
      }
      else
      {
        throw new Exception('PHP COM Extension is missing',
          Exception::ERROR_UUID_COMEXTENSIONMISSING);
      }
      //@codeCoverageIgnoreEnd
    }
    else
    {
      //remove from coverage analysis
      //@codeCoverageIgnoreStart
      $sUuid = \trim(\exec('uuid -v 4'));
      return $sUuid;
      //@codeCoverageIgnoreEnd
    }
  }
}
